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What is a strut bearing and how can I tell if it’s bad?
You know this from the various forums you visit: some write strut mount suspension bearings, others just strut suspension bearings, and others just shorten it to strut mounts. The difference between the mounts and the bearings is one of perspective. As a hobby mechanic, you know that mounts and bearings are often used interchangeably – and yet they are two different things.
What is the difference between strut bearing and strut mount?
A strut mount in the broader sense consists of an upper and lower side. The lower side lies directly on the suspension strut and is the actual support bearing. This is a support function – hence the name "strut support bearing". The mount in the narrower sense is the upper part that connects it to the dome in the wheel housing – hence the name "strut mount". This component is flexible and is responsible for the return of the strut after steering manoeuvres and, in reality, used for both.
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Rear Axle
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Function and symptoms of defects
The support bearing, such as a VW strut bearing functions as an important suspension component connecting the car body to the strut. Front axle bearings enable it rotate for smooth, precise steering. The two front axle mounts rotate inside the dome during steering and so provide easy and accurate steering. Additionally, the bearing adjust its position to a degree. The cushioning result of the mount also means that any noise or vibration of the chassis is not transferred to the car body. Defective bearings affect the driving behaviour of a car in several ways. Depending on how badly the strut mount is damaged, you will notice these symptoms:
- Extended braking distances
- Reduced steering angle
- Problems with wheel control – the alignment can become uneven
- Irregular tyre wear
- Increased wear of shock absorbers
How to detect a faulty suspension strut bearing
There are several signs to look out for if you need to identify a faulty bearing. If you hear a loud banging sound when driving on top of a chuckhole, or a slight thud when you drive on top of smaller road bumps, this may be indicative of a defect that also has an effect on your shock absorbers and you may need to buy car shock absorbers online.
- Your steering is sluggish, sometimes even erratic; it has greater give than is customary, or has a delayed response to steering movements.
- Make sure the engine is started and that you have applied the handbrake. Turn the steering wheel gently in either direction. Have someone outside of the car listen carefully. If they hear a slight squeak or creak, one or even both bearings are probably defective and you should replace the rear and front strut bearings as soon as possible.
So it is clear that it is hazardous to drive a car with faulty strut mounts and bearings. Apart from the issue of safety, there is also a financial motivation to replace them if they are faulty. Over the course of time, they result in subsequent damage to other suspension components – resulting in additional and unnecessary repair costs for you.
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